In the first few weeks of pregnancy, a young placenta is usually called a chorion, which is vital for the full development of the child. Normally, the placenta is attached to the bottom of the uterus or on the back wall. But sometimes the chorion blocks the pharynx completely or partially, settling down in the lower part. In this case, talk about the presentation of the chorion .
Danger of chorion presentation
The presentation of the chorion is determined at week 12 during the first planned ultrasound. It is possible to detect pathology at an earlier time if ultrasound is performed for some reason up to 12 weeks. With this diagnosis, a woman is assigned bed rest, most often requires hospitalization to control pregnancy. In the process of growth of the membranes and the uterus, the placenta often rises to the top, which is considered the most favorable development of events. This is called "migration of the placenta". For example: the presentation of the chorion at week 15 may completely disappear by 20-25 weeks. Any attachment of the chorion is a variant of the norm, when the baby is located at a distance of 3 cm above the internal pharynx.
Partial overlapping of the internal pharynx increases the risk of bleeding and spontaneous miscarriages. But even in this case, after careful examination, a woman is observed outpatiently. If the chorion is located so low that it completely blocks the pharynx, then at the very beginning of the third trimester of pregnancy, even if you feel perfectly well, you will have to go to the hospital. This is associated with an increased risk of developing a sharp placental abruption and severe bleeding that threatens the life of a woman. If the pathology is detected, the thickness of the chorion is measured at 12 weeks and further, which in the first trimester should equal (in mm) the gestation period (in weeks). If the presentation is preserved until the very childbirth, the child appears in the light by a cesarean section,
Causes
The presentation of the chorion at week 11 is most often the result of serious inflammation, which is often associated with complications after abortion . Uterine tissues are damaged, as a result of which the egg can not attach itself in the most physiological place for it (anterior or posterior wall of the uterus). In addition, the presentation of the chorion of 12 weeks may occur due to multiple myomas or polyps of the uterus. Therefore, when planning pregnancy, it is recommended that all existing lesions be removed.